Sea cucumbers
Algae
Small fish
Other sea urchins
Because a sea urchin's egg is relatively big
Because sea urchins have large numbers of relatively big eggs
Because the eggs make great omlettes
Because sea urchins have large numbers of eggs
Purpuratus
Strongylocentrotus
Animalia
Echinoderms
Dome
Toothpick
Pentamerous
Porcupine
Mouth
Feet
Spine
Nose
Subtidal area only
On the beach
Both intertidal area and subtidal areas
Intertidal area only